Refactor ERB version checking for keyword arguments

Improving code like r62590. See r62529 for details.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62594 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 3 insertions, 5 deletions

diff --git a/tool/generic_erb.rb b/tool/generic_erb.rb
index 42555ef0a0..8672907b99 100644
--- a/tool/generic_erb.rb
+++ b/tool/generic_erb.rb
@@ -34,8 +34,7 @@ unchanged = color.pass("unchanged")
 updated = color.fail("updated")
 
 result = templates.map do |template|
-  match = ERB.version.match(/\Aerb\.rb \[(?<version>[^ ]+) /)
-  if match && match[:version] >= '2.2.0' # Ruby 2.6+
+  if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
     erb = ERB.new(File.read(template), trim_mode: '%-')
   else
     erb = ERB.new(File.read(template), nil, '%-')
diff --git a/tool/ruby_vm/helpers/dumper.rb b/tool/ruby_vm/helpers/dumper.rb
index 8ac8b1c4ce..ccd5717cc8 100644
--- a/tool/ruby_vm/helpers/dumper.rb
+++ b/tool/ruby_vm/helpers/dumper.rb
@@ -32,8 +32,7 @@ class RubyVM::Dumper
   rescue Errno::ENOENT
     raise "don't know how to generate #{path}"
   else
-    match = ERB.version.match(/\Aerb\.rb \[(?<version>[^ ]+) /)
-    if match && match[:version] >= '2.2.0' # Ruby 2.6+
+    if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
       erb = ERB.new(src, trim_mode: '%-')
     else
       erb = ERB.new(src, nil, '%-')
diff --git a/tool/transcode-tblgen.rb b/tool/transcode-tblgen.rb
index 4e829314b2..c9867f95fa 100644
--- a/tool/transcode-tblgen.rb
+++ b/tool/transcode-tblgen.rb
@@ -1078,7 +1078,7 @@ if __FILE__ == $0
   end
 
   libs1 = $".dup
-  if ERB.version[/\d+\.\d+/] >= '2.2'
+  if ERB.instance_method(:initialize).parameters.assoc(:key) # Ruby 2.6+
     erb = ERB.new(src, trim_mode: '%')
   else
     erb = ERB.new(src, nil, '%')